Upgrade your sliding brake calipers to the better rear two-pot calipers. For the 02-05 WRX and the 08-17 WRX you WILL need a rear caliper bracket to get these to mount properly to your vehicle. See from the options below.
This kit will include the RED two-piston calipers for the rear with the option to add the caliper hardware: cross springs, pad pins and pin clips.